Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1b9df936b57e1e…

MALICIOUS

PDF

76.0 KB Created: 2021-03-25 06:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 031776e4fbddb80a234ae7389788083d SHA-1: 93ffa652dcdef715042dfe59c05e1598b2e25e56 SHA-256: 7e1b9df936b57e1e5101e03b1c939b0556758cda35c05b6aecc70ac86dbebf8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mezovuduw.ru/strik?utm_term=who+will+buy+used+books+near+me PDF link annotation
    • https://cdn.sqhk.co/ganuniwiku/japjfjd/33182001087.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/ejex6hg/42088958126.pdfIn PDF document text
    • https://cdn.sqhk.co/kejaxedusuk/jagh7BF/78324209429.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/43152111544waef9.pdfIn PDF document text
    • https://cdn.sqhk.co/muluxodipoto/jzjiogz/bakonegumigakememexorifof.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/YHugfeT/9169394308.pdfIn PDF document text
    • http://logvoz.ru/fibubapijawaparosorepaku24aja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_1f43773fb5c64a7094fe8880bdd81eb8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wolawatin/angular_format_date_locale_example.pdfIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_4ab454ca4e3b4dc99933493342ed2ee4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/76062390508.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/tubozuzixaraxe.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/2005_dodge_grand_caravan_sxt_blue_book_value.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/britax_boulevard_clicktight_convertible_car_seat_rear_facing_height_limit.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/jacoco_report_not_found.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/supilufigejaxadef.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/proform_cardio_hiit_elliptical_cross_trainer.pdfIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_7b281e6a58e44a638c045c3f2adab246.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/chain_rule_problems.pdfIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_c7e333ad08704aaf98b77c447cce83c9.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE842 5476 bytes
SHA-256: 4403cd9a35a6d312b3099742eb9c232650fc657da16bb43d9f845cbfd4e5997d
font_01_sfnt_off0000face.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 11808 bytes
SHA-256: 4a211229ef4771ee7682a3dd37f950792de1d30fdbb7541aa870199bdfc9458f

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